What is a challenge that organisms living in an estuary face that other aquatic organism normally do not face?
A. changes in temperature at different depths
B. daily changes in salinity
C. movement of water
D. light penetrating only through the photic zone
E. damage from pollution
Answer: B. daily changes in salinity
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During which growth phase are bacteria more susceptible to antimicrobial drugs?
A) lag phase B) log phase C) stationary phase D) death phase E) The susceptibility is the same for all phases.
What type of immunity results from recovery from an infection such as the chickenpox?
a. naturally acquired active immunity b. naturally acquired passive immunity c. artificially acquired active immunity d. artificially acquired passive immunity
The Ames Test uses______ to determine the ability of a compound to cause______.
a) Bacteria, AIDS b) Viruses, Cancer c) Bacteria, Cancer d) Viral cells, AIDs
____ are cells that lay the framework for new phloem and xylem in vascular plants. Prior to the differentiation of these cells, their precursors transported auxin out of immature leaves
Fill in the blank with the appropriate word.